CUET General Test 2022 24 Aug Shift 1 PYQs

If * is an operation such that a * b = 3a - 4b, find the value of 3*4

If : $a + b + c = 14$ and $a^2 + b^2 + c^2 = 96$, then $(ab + bc + ca)$ is

How many terms are there in the A.P. 3, 7, 11, ............ 407 ?