Fine the sum of A.P. – 2 + 6 + 10 + 14 + 18 + 22 + 26 =____________.
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Solution

$S u m o f n t e r m s o f a n A . P . = \frac{n [2 a + (n - 1) d]}{2}, a = 2, n = 7, d = 4$

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Class-intervals	$6 - 10$	$10 - 14$	$14 - 18$	$18 - 22$	$22 - 26$	$26 - 30$
Frequency	$4$	$6$	$9$	$12$	$7$	$2$

Class interval	10-14	14-18	18-22	22-26	26-30	30-34	34-38	38-42
Frequency	8	6	11	20	25	22	10	4

6, 8, 9, 12, 14, 18, 22, 26, 30

a_{25} - a_{15}

- 6, - 10, - 14, - 18, . . . . . . . . . .

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