Question

Find the 1st term of a sequence if the common difference = -2 and the 13th term =59

Answer 1

83

Explanation:

Formula for 13th term:

t(13) = a + 12d, where a- first term, d- common difference

Given

• t(13) = 59
• d = -2
• a = ?

As per the formula for 13th term:

• 59 = a + 12*(-2)
• 59 = a - 24
• a = 59 + 24
• a = 83