Find 15th term from end of the AP: 21, 42, 63, 84,... 585?
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12
Answer:
325
Explanation:
Given A.P. :—
- 21, 42, 63, 84 . . . 585.
Find it's 15th term.
We know that,
nth term of an A.P. = a + (n - 1)d
Where,
- a(first term) = 21
- n(number of terms) = 15.
- d(common difference) = 42 - 21 = 21
Substitute the values,
∴ 15th term of the A.P. is 325.
__________________________
Formula :
- nth term of an A.P. = a + (n - 1)d.
Where,
- a denotes the first term.
- n is the number of terms.
- d is presented as the common difference.
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