#include#define ADD(a,b)(a+b)#define SQUARE(x)(x*x)int main(){int x=2;int y=3;int z = ADD(SQUARE(x++),y);        // here is the cache which is 1st time Square takes 2 and 2nd time give 3 means SQUARE(old x*updated x)= SQUARE(2*3) gives 6  then add(6+3)=9printf("%d\n",z);return 0;}So the answer is 9 [...]

$From$ $these$ $given$ $numbers$ $We$ $can$ $make$  $Composite$ $numbers$ $only$  $8,9,10, 12,14,16,18$ $2+7=9$ $3+5=8$ $3+7=10$ $3+11=14$ $5+7=12$ $5+11=16$ $11+7=18$ $2$  $can$  $Come$   $only$  $First$  $Or$  $Last$  $Position $   $Coz$  $if$  $it'll$  $come$  $in$  $middle$  $then$  $we$ $can't$  $make$  $Composite$ $number$ $with$ $the$ $consecutive$ $sum.$ $\underbrace{2 }$    __    __    __   __    $OR$            __    __    __   __      $\underbrace{2 }$ $7$  $Can$   $only$  $come$   $beside$  $2$ $2$    $7$    __    __   __        $OR$                __    __    __    $7$    $2$ $In$  $Remaining$   $3$   $places$   $3$,  $5$, $11$  $can$   $come$ $3!$ $ways.$ $So$ $ultimately$   $these$  $Can$ $Come$  $2*1 *3!$    $=$  $12$     [...]

An urn contains $n$ heliotrope and $n$ tangerine balls. A fair die with $n$ sides is rolled. If the $r^{th}$ face is shown, $r$ balls are removed from the urn and placed in a bag. What is the probability that a ball removed at random from the bag is tangerine? [...]

nth group starts with $(n-1)$$^{2}$ $+$ $1$ and ends with $n$$^{2}$ and every group consists $2n-1$ numbers $15th$ group starts with 196 and ends with $225$ $sum$ = $\frac{No of terms}{2}$ * $[first$ $term$+$last$ $term]$ = $\frac{29}{2} * [(196+1) + 225]$ = $6119$ [...]

acknowledge-Ignored [...]

Another Approach: It is given 4th term=8 so consider an AP with 7 terms as following a-3d , a-2d , a-d , a , a+d , a+2d , a+3d Here 4th term = a = 8 Sum of the above series= 7*8=56 Answer= 56 [...]