Question

Need help with the letter c please

Answer 1

S = n/2 ( a + l )

where,

n is the number of term

a is the first term and l is the last term.

here, a = 3, d = 3, n = 300 / 3 = 100

So, S = 100/2 ( 3 + 300 )

S = 50 × 303

S = 15150