Sort:  

The answer is 45

It is a wrong answer

that would be 45

f(1,4)=5
f(2,5)=12
f(3,6)=21
f(5,8)=a
solve for a
=> f(a,b)=a * b+a
f(5,8)=5 * 8+5=45
answer: 45

Coin Marketplace

STEEM 0.30
TRX 0.12
JST 0.032
BTC 59244.49
ETH 2977.21
USDT 1.00
SBD 3.77