Answered

find the sum of the first 12 terms of the sequence (3,8,13,...)

Sagot :

H78viz

ANSWER :

The sum of the 12 terms is 366.

STEP BY STEP EXPLANATION :

Sn = [(A1 + An) × n]/2

S12 = [(3 + (3 + 11 × 5)) × 12]/2

S12 = [(3 + (3 + 55)) × 12]/2

S12 = [(3 + 58) × 12]/2

S12 = [61 × 12]/2

S12 = 732/2

S12 = 366

Therefore , the sum of the 12 terms is 366.

#BrainlySummerChallenge

OK.