For an $A P$ if $a_{25} - a_{20} = 45$ then find the value of $" d "$ .

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Solution

Let first term be $a$ ,
According to question,

$a_{25} - a_{20} = 45$

$⟹ a + 24 d - (a + 19 d) = 45$

$⟹ 5 d = 45$

So, $d = 9$

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Similar questions

a_{1}, a_{2}, a_{3}, a_{4}, . . {. ., a}_{20}

a_{1} + a_{20} = 45

a_{1} + a_{2} + a_{3} + a_{4}, . . {. . + a}_{20}

d

a_{1} = 10

a_{20} = 466

IF $a_{n}$ denotes the nth term of the AP 2, 7, 12, 17, ..., find the value of $(a_{30} - a_{20})$ .

If $a_{n}$ denotes the nth term of the AP 3, 8, 13, 18, ... then what is the value of $(a_{30} - a_{20})$
(a) 40 (b) 36 S(c) 50 (d) 56

a_{30} - a_{20}

A P

: a, a + d, a + 2 d, a + 3 d, . . .

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