Question

find the sum of first 50 terms of the sequence 3+7+11+15+.......​

Answer 1

Step-by-step explanation:

$here \: a = 3 \: \\ \: \: d = 4 \\ to \: find \: \\ S50 = \frac{n}{2} \times (2a + (n - 1) \times d) \\ \: \: \: \: \: \: \: \: = 25 \times (6 + 49 \times 4) \\ \: \: \: \: \: \: \: \: = 202 \times 25 = 5050$