Progression (Sequence and Series)Hard
Question
A group of 10 items has mean 6. If the mean of 4 of these items is 7.5, then the mean of the remaining items is-
Options
A.6.5
B.5.5
C.4.5
D.5.0
More Progression (Sequence and Series) Questions
If are in A.P. then-...If x18 = y21 = z28, then 3, 3 logy x, 3 logz y, 7 logx z are in -...The sum of 10 terms of the series. 0.7 + .77 + .777 + ... is-...If a1, a2, a3, ......, an are in H.P. and a1a2 + a2a3 + a3a4 +......+ an−1 an = ka1an, then k is equal to -...In the following two A.P.′s how many terms are identical ? 2,5,8,11.... to 60 terms, 3,5,7, ..... 50 terms...